Experiments on ion cyclotron damping at the deuterium fourth harmonic in DIII-D

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Absorption of fast Alfven waves by the energetic ions of an injected beam is evaluated in the DIII-D tokamak. Ion cyclotron resonance absorption at the fourth harmonic of the deuteron cyclotron frequency is observed with deuterium neutral beam injection (f = 60 MHz, B{sub T} = 1.9 T). Enhanced D-D neutron rates are evidence of absorption at the Doppler-shifted cyclotron resonance. Characteristics of global energy confinement provide further proof of substantial beam acceleration by the rf. In many cases, the accelerated deuterons cause temporary stabilization of the sawtooth (monster sawteeth), at relatively low rf power levels of {approximately}1 MW.

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5 p.

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Pinsker, R.I.; Petty, C.C.; Baity, F.W.; Bernabei, S.; Greenough, N.; Heidbrink, W.W. et al. May 1, 1999.

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Description

Absorption of fast Alfven waves by the energetic ions of an injected beam is evaluated in the DIII-D tokamak. Ion cyclotron resonance absorption at the fourth harmonic of the deuteron cyclotron frequency is observed with deuterium neutral beam injection (f = 60 MHz, B{sub T} = 1.9 T). Enhanced D-D neutron rates are evidence of absorption at the Doppler-shifted cyclotron resonance. Characteristics of global energy confinement provide further proof of substantial beam acceleration by the rf. In many cases, the accelerated deuterons cause temporary stabilization of the sawtooth (monster sawteeth), at relatively low rf power levels of {approximately}1 MW.

Physical Description

5 p.

Notes

INIS; OSTI as DE99003185

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  • 13. topical conference on applications of radio frequency power to plasmas, Annapolis, MD (United States), 12-14 Apr 1999

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  • Other: DE99003185
  • Report No.: GA--A23092
  • Report No.: CONF-990411--
  • Grant Number: AC03-99ER54463;W-7405-ENG-48;AC05-96OR22464;AC02-76CH03073;FC03-95ER54299;FG02-90ER54084
  • DOI: 10.2172/354995 | External Link
  • Office of Scientific & Technical Information Report Number: 354995
  • Archival Resource Key: ark:/67531/metadc683903

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  • May 1, 1999

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  • July 25, 2015, 2:20 a.m.

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  • Aug. 3, 2016, 1:50 p.m.

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Pinsker, R.I.; Petty, C.C.; Baity, F.W.; Bernabei, S.; Greenough, N.; Heidbrink, W.W. et al. Experiments on ion cyclotron damping at the deuterium fourth harmonic in DIII-D, report, May 1, 1999; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc683903/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.